If cos^(-1) x +cos^(-1) y+cos^(-1)z=3pi,...

If `cos^(-1) x +cos^(-1) y+cos^(-1)z=3pi`, then` xy+yz+zx` is equal to :

A

`-3`

B

0

C

3

D

`-1`

Verified by Experts

The correct Answer is:

C

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